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Shareholders' Equity - Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 25,890    
Other comprehensive (loss) income before reclassifications, net of taxes (198) $ (227) $ (106)
Amounts reclassified into income, net of taxes 35 42 46
Ending balance 25,390 25,890  
AOCI Attributable to Parent      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (1,732) (1,548) (1,488)
Ending balance (1,895) (1,732) (1,548)
Foreign Currency Translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (1,244) (1,078) (987)
Other comprehensive (loss) income before reclassifications, net of taxes (109) (166) (91)
Amounts reclassified into income, net of taxes 0 0 0
Ending balance (1,353) (1,244) (1,078)
Benefit Plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (557) (571) (574)
Other comprehensive (loss) income before reclassifications, net of taxes (111) (32) (37)
Amounts reclassified into income, net of taxes 32 46 41
Ending balance (636) (557) (571)
Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 70 103 75
Other comprehensive (loss) income before reclassifications, net of taxes 21 (28) 21
Amounts reclassified into income, net of taxes 3 (4) 6
Ending balance 94 70 103
Available-for-Sale Debt Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (1) 0 0
Other comprehensive (loss) income before reclassifications, net of taxes 1 (1) 0
Amounts reclassified into income, net of taxes 0 0 0
Ending balance $ 0 $ (1) $ 0